Vestibule-latch.



GIN. MASON.

VESTIBULE LATCH. APPLICATION FILED SEPT. 5, 1912.

Patented May 20, 1913.

FIG: ,2

lvwawtoz 'HGE 1 '4 o side for engagement by the cam 20 onthe UNITED T T PA E T JQFFIQE enonen N. mason, or READING, rnnnsrr vmm, Assumes. TO ananmenannwann comremr, or READING, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

T VESTIBULE-LATCH.

Patented May 20,

To all whom it may concern: a l

Be it "known that I, Gnonen N. MASON,

citizen of the United States, residing at,

. fication.

' inside key operating means.

This invention relates to improvements in latches of the character known as vestibule latches and the object in the present invention isto provide a device in which the latch isoperable from either side by the knob spindle and only from the outside by means of a key cylinder and in which the outsideknob action is locked from the inside througha key cylinder.

The invention consists of a shde adapted to engage the outside operatlnghub and lock it against turning, which slide is actuated through the medium of a lever which is in turn actuated in either direction by the Theinvention is more fully described in the following specification and clearlyillustrated in the accompanying drawing, 1n which Figure 1 is an elevationiof my lock with.

the back plate of the casing removed and showing the outside knob operating means locked against turning. Fig. 2 is a sectional view through 22 of Fig. 1. Fig. 3 is a View similar to Fig. 1, but with the latch retratced and the outside knob operating means free to turn. I

The numeral 1 designates the casing and 2 the-latch bolt which is .provided with a spring 3 to keep it normally in projected position. The bolt has a yoke 5 at its rear end and is formed with a boss 1 at its upper outside key cylinder (not shown).

The spindle hub is in two parts, 6 designating the outside and 6 the inside hub bolt. Fig. 3 shows this lever holding the hubs in normal position.

latch bolt in retracted position but with the .The hub member 6, is formed with a slot 8 on its face in horizontal alinement with and adapted to be engaged by the end of a slide 9. The slide is provided with a spring" 10 to keep it in either forward or locked Application flle'd September 5, 1912. Serial No. 71 ,648.

position. The slide carries a in 11 on its face which isengaged by the bifurcated end 12 of an actuating lever 13. This lever 13 is ivoted atits upper end to the casing and 1s formed with a relatively long arm 14 at one side and with a relatively short'arm 15 at the opposite side. The numeral 16 designates a supplemental lever a'lso pivoted in the casingand formed with a leg 17 adapted to engage the short arm 15.

18' designates the inside key cylinder and 19' the cam carried thereby. This cam is adapted to contact with both the lever 16 and the long'arm 14 of the lever 13.

The action of the latch is as follows n-The position of the parts as shown in Fig. 1 indicate'that the cam 19 has been turned until it has compressed or forced' down the end of the lever 16, which, through contact of the leg 17 with the short arm 15 has turned the lever 13 on its pivot and forced the slide 9 into engagement with the slot 8 in the hub 6 thus locking the latch against movement by the outside knob. The continued move ment of the cam 19 will cause it to contact with the long arm 14 (after it passes ofiof the end of the lever. 16) and move the lever 13 in the opposite direct-ion, which position is shown in Fig. 3, thus releasing the hub 6 by the withdrawal of the slide 9 from engagement therewith. I

It is evident that with the parts in the position shown'in Fig. 3, the latch may be retracted by either the inside or outside'knob spindle, while in the position shown in Fig;

yoke 5 and retract the latch bolt. This outside cam is sufliciently shorter than the'cam 19 to permit it to pass the ends of the lever 16 and arm .14. 7

It will be noted that both the locking and unlocking of the outside knob action is a'ccomplished bylconsiderably less than one complete revolution of the cam, and in the same direction.

I c1aim: l 1. In a latch the combination of a casing, with a latch bolt; inside and outside knob operated means including a two-part hub for retracting the latch bolt; one part of which is formed with a lock engaging slot; a yoke on the inner end of the bolt; a boss on said yoke; outside key operated means for re- 'arm, for moving said slide out of engagement with the outside knob operated means.

2. In a latch the combination of a casing; a latch bolt; a yoke on the inner end of the bolt; a boss on the yoke; inside and outside knob operated means for retracting the latch bolt; outside key operated means including weave lever in engagement with and adapted to i move said slide into and out of engagementwith the outside knob operated means; a supplemental lever adapted to move said pivoted lever in one direction, and a key operated cam adapted to move said lever in t e opposite direction whereby the outside knob operated means are locked or unlocked by the locking slide.

In testimony whereof I afiix my signature in presence of two witnesses.

GEORGE N. MASON.

Witnesses:

ED. A. KELLY, CLARA E. YOUNG. 

